diff options
| -rw-r--r-- | arch/x86/include/asm/tlbflush.h | 11 | ||||
| -rw-r--r-- | arch/x86/kernel/process.c | 2 |
2 files changed, 9 insertions, 4 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index e736f7f0ba92..877b5c1a1b12 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -175,6 +175,7 @@ static inline void cr4_init_shadow(void) static inline void __cr4_set(unsigned long cr4) { + lockdep_assert_irqs_disabled(); this_cpu_write(cpu_tlbstate.cr4, cr4); __write_cr4(cr4); } @@ -182,24 +183,28 @@ static inline void __cr4_set(unsigned long cr4) /* Set in this cpu's CR4. */ static inline void cr4_set_bits(unsigned long mask) { - unsigned long cr4; + unsigned long cr4, flags; + local_irq_save(flags); cr4 = this_cpu_read(cpu_tlbstate.cr4); if ((cr4 | mask) != cr4) __cr4_set(cr4 | mask); + local_irq_restore(flags); } /* Clear in this cpu's CR4. */ static inline void cr4_clear_bits(unsigned long mask) { - unsigned long cr4; + unsigned long cr4, flags; + local_irq_save(flags); cr4 = this_cpu_read(cpu_tlbstate.cr4); if ((cr4 & ~mask) != cr4) __cr4_set(cr4 & ~mask); + local_irq_restore(flags); } -static inline void cr4_toggle_bits(unsigned long mask) +static inline void cr4_toggle_bits_irqsoff(unsigned long mask) { unsigned long cr4; diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 97fb3e5737f5..bb988a24db92 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -299,7 +299,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p, } if ((tifp ^ tifn) & _TIF_NOTSC) - cr4_toggle_bits(X86_CR4_TSD); + cr4_toggle_bits_irqsoff(X86_CR4_TSD); if ((tifp ^ tifn) & _TIF_NOCPUID) set_cpuid_faulting(!!(tifn & _TIF_NOCPUID)); |